body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
      margin: 0;
      padding: 0;
      background-color: #f4f4f9;
      color: #333;
      line-height: 1.6;
    }

    .container {
      max-width: 1100px;
      margin: auto;
      overflow: hidden;
      padding: 0 20px;
    }

    header {
      background: #fff;
      padding: 2rem 0;
      text-align: center;
      border-bottom: 1px solid #ddd;
      position: relative;
      /* <-- 必须，供 language-selector 和 header-buttons 绝对定位 */
    }

    header .app-logo {
      width: 120px;
      height: 120px;
      border-radius: 22%;
      margin-bottom: 1rem;
    }

    header h1 {
      font-size: 3rem;
      margin: 0;
      color: #583d72;
    }

    header p {
      font-size: 1.2rem;
      color: #666;
    }

    .hero {
      background: linear-gradient(45deg, #583d72, #7e57c2);
      color: white;
      padding: 6rem 0;
      text-align: center;
      position: relative;
    }

    .hero .container {
      position: relative;
      z-index: 1;
    }

    .hero h2 {
      font-size: 2.5rem;
      margin-bottom: 1rem;
    }

    section {
      padding: 4rem 0;
      text-align: center;
    }

    .section-title {
      font-size: 2.2rem;
      margin-bottom: 2rem;
      color: #583d72;
    }

    .features-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 2rem;
      text-align: left;
    }

    .feature-card {
      background: #fff;
      padding: 2rem;
      border-radius: 8px;
      box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    }

    .feature-card h3 {
      font-size: 1.5rem;
      margin-top: 0;
      color: #583d72;
    }

    .image-gallery {
      display: flex;
      justify-content: center;
      gap: 1.5rem;
      margin-top: 2rem;
      flex-wrap: wrap;
    }

    .image-gallery img {
      width: 100%;
      max-width: 350px;
      height: auto;
      border-radius: 8px;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
      object-fit: cover;
      flex-grow: 1;
    }

    .privacy-section {
      background-color: #333;
      color: #fff;
    }

    .privacy-section .container {
      max-width: 800px;
    }

    .privacy-section h3 {
      color: #fff;
    }

    .cta {
      background-color: #583d72;
      color: #fff;
      padding: 4rem 0;
    }

    .cta h2 {
      font-size: 2rem;
      margin-bottom: 2rem;
    }

    .cta-button {
      display: inline-block;
      background: #fff;
      color: #583d72;
      padding: 1rem 2rem;
      text-decoration: none;
      border-radius: 5px;
      font-weight: bold;
      margin: 0.5rem;
      transition: transform 0.2s;
    }

    .cta-button:hover {
      transform: scale(1.05);
    }

    footer {
      text-align: center;
      padding: 2rem 0;
      background: #333;
      color: #fff;
    }

    .footer-link {
      color: inherit;
      text-decoration: none;
      display: inline-block;
      padding: 2px 4px;
      border-radius: 3px;
      transition: background-color 0.2s;
    }

    .footer-link:hover {
      background-color: rgba(255, 255, 255, 0.1);
      text-decoration: underline;
    }

    /* 语言选择下拉微调 */
    .language-selector {
      position: absolute;
      top: 14px;
      right: 20px;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      padding: 6px;
      border-radius: 6px;
      box-shadow: 0 6px 14px rgba(0, 0, 0, 0.08);
    }

    .language-selector select {
      padding: 0.3rem 0.5rem;
      font-size: 0.95rem;
      border-radius: 4px;
      border: 1px solid #ddd;
      background: white;
    }

    /* === 新增按钮样式和布局 === */

    .header-buttons {
      position: absolute;
      top: 20px;
      left: 20px;
      z-index: 1000;
      display: flex;
      gap: 10px;
    }

    .tech-button {
      display: inline-block;
      padding: 8px 15px;
      font-size: 1rem;
      font-weight: 600;
      text-decoration: none;
      color: #583d72;
      /* 按钮文字颜色 */
      background-color: #fff;
      /* 按钮背景色 */
      border: 2px solid #583d72;
      /* 边框颜色 */
      border-radius: 8px;
      transition: all 0.3s ease-in-out;
      box-shadow: 0 0 5px rgba(88, 61, 114, 0.5);
      /* 初始淡紫色光晕 */
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }

    .tech-button:hover {
      /* 悬停时的科技感霓虹效果 */
      color: #fff;
      /* 悬停时文字变为白色 */
      background-color: #7e57c2;
      /* 悬停时背景变为深紫色 */
      border-color: #c0a8e6;
      /* 悬停时边框变亮 */
      box-shadow:
        0 0 10px #a289cc,
        /* 强光晕 */
        0 0 20px #a289cc,
        /* 稍远光晕 */
        0 0 30px #7e57c2;
      /* 最远光晕 */
      transform: translateY(-2px);
    }

    /* 响应式小修 */
    @media (max-width: 600px) {
      header h1 {
        font-size: 2rem;
      }

      .hero {
        padding: 3.5rem 0;
      }

      /* 手机上将按钮移到顶部中央或隐藏 */
      .header-buttons {
        position: static;
        justify-content: center;
        margin-bottom: 10px;
      }

      header .container {
        display: flex;
        flex-direction: column;
        align-items: center;
      }

      .language-selector {
        top: 10px;
        right: 10px;
      }
    }

    /* 固定底部栏样式 */
    .cta-fixed-bar {
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background-color: #583d72;
      color: #fff;
      padding: 15px 0;
      text-align: center;
      box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
      z-index: 100;
      display: flex;
      justify-content: center;
      align-items: center;
    }

    .cta-fixed-bar .container {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 20px;
      padding: 0 20px;
      width: 100%;
      max-width: 1100px;
    }

    .cta-text-prompt {
      font-size: 1.2rem;
      font-weight: 500;
      margin: 0;
    }

    /* 包含按钮和二维码的容器 */
    .cta-actions {
      display: flex;
      align-items: center;
      gap: 15px;
      /* 按钮和二维码之间的间距 */
    }

    /* 下载按钮样式 (保持不变) */
    .cta-button {
      display: inline-flex;
      align-items: center;
      background: #fff;
      color: #583d72;
      padding: 10px 20px;
      text-decoration: none;
      border-radius: 8px;
      font-weight: bold;
      border: 2px solid #fff;
      transition: all 0.2s ease-in-out;
      box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    }

    .cta-button:hover {
      background-color: #f0f0f0;
      border-color: #7e57c2;
      transform: translateY(-2px);
      box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
    }

    .app-store-icon {
      width: 24px;
      height: 24px;
      margin-right: 10px;
      fill: #583d72;
    }

    /* 二维码容器及图片样式 */
    .qr-code-wrapper {
      display: flex;
      flex-direction: column;
      align-items: center;
    }

    .qr-code {
      width: 50px;
      /* 调整二维码大小 */
      height: 50px;
      background-color: #fff;
      border-radius: 4px;
      padding: 5px;
      /* 为二维码添加一些内边距 */
    }

    .qr-label {
      font-size: 0.8rem;
      color: #fff;
      margin-top: 5px;
      /* 调整标签与二维码之间的间距 */
    }

    /* 手机端响应式样式调整 */
    @media (max-width: 600px) {
      .cta-fixed-bar .container {
        flex-direction: column;
        gap: 10px;
      }

      .cta-text-prompt {
        display: none;
      }

      .cta-actions {
        flex-direction: column;
        /* 在小屏幕上，按钮和二维码垂直排列 */
      }

      .qr-code-wrapper {
        display: none;
        /* 在手机上可以隐藏二维码，因为用户无法扫描自己手机上的码 */
      }
    }